*{
    margin: 0;
    padding: 0;
}

body{
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(15deg, #13547a, #80d0c7);
}

.loader{
    width: 200px;
    height: 200px;
    position: relative;
}

.loader div{
    border-width: 5px;
    border-style: solid;
    border-left-color: #fff;
    border-right-color: #fff;
    border-top-color: transparent;
    border-bottom-color: transparent;
    border-radius: 50%;
    position: absolute;
    animation: spin 4s  ease infinite;
}

.loader div:nth-child(1){
    width: 50px;
    height: 50px;
    left: 70px;
    top: 70px;
}

.loader div:nth-child(2){
    width: 70px;
    height: 70px;
    left: 60px;
    top: 60px;
    animation-delay: 0.1s;
}

.loader div:nth-child(3){
    width: 90px;
    height: 90px;
    left: 50px;
    top: 50px;
    animation-delay: 0.2s;
}

.loader div:nth-child(4){
    width: 110px;
    height: 110px;
    left: 40px;
    top: 40px;
    animation-delay: 0.3s;
}

/*animation*/
@keyframes spin {
    50%{
        transform: rotate(360deg);
    }
    100%{
        transform: rotate(0);
    }
}